VTRD rand system. Variable Thickness Rand Technology features strategically varying thicknesses on the toe rand. The High Wear Zone will be engineered to be thicker and more durable than other areas of the rand which will not only enhance the toe box structure but prevent toe-bulge. The advantages of VTRD: •Prevents toe-bulge and maintains toe box structure. •More durability in the High Wear Zone. •Waste reduction during manufacturing process.